1. (两台机器或两个通信系统之间的)连接，接合
A link-up is a connection between two machines or communication systems.

e.g. ...a live satellite link-up with Bonn.
与波恩的直播卫星连接
e.g. ...computer link-ups with banks in Spain, Portugal, and France.
与西班牙、葡萄牙、法国银行的计算机联网

2. （两个组织之间的）联系，合作关系
A link-up is a relationship or partnership between two organizations.

e.g. ...new link-ups between school and commerce...
学校与商业的新合作
e.g. The US airline has just announced a formal link-up with British Airways.
这家美国航空公司刚刚宣布了与英国航空公司的正式合作。